May be all good - the Tascam interface is input and output so 8 plugs is 4 in and 4 out, ie hopefully 4 x stereo each input/output Tascam - DB-25_Pinout.pdf.

Needs confirming though.

Meridian owner since 1992
Prime & PSU, Focal Elear headphones, Roon (ROCK 8Gi5 NUC), Explorer 1 & 2, F80. 200/203, various Sonos (via Roon).